[Fix] parse: with comma true, handle field that holds an array of arrays

Fixes #327.

Author: Mohamed Omar

lib/parse.js

@@ -3,6 +3,7 @@
 var utils = require('./utils');
 
 var has = Object.prototype.hasOwnProperty;
+var isArray = Array.isArray;
 
 var defaults = {
     allowDots: false,
@@ -87,6 +88,10 @@ var parseValues = function parseQueryStringValues(str, options) {
             val = val.split(',');
         }
 
+        if (part.indexOf('[]=') > -1) {
+            val = isArray(val) ? [val] : val;
+        }
+
         if (has.call(obj, key)) {
             obj[key] = utils.combine(obj[key], val);
         } else {

test/parse.js

@@ -414,6 +414,15 @@ test('parse()', function (t) {
         st.end();
     });
 
+    t.test('parses brackets holds array of arrays when having two parts of strings with comma as array divider', function (st) {
+        st.deepEqual(qs.parse('foo[]=1,2,3&foo[]=4,5,6', { comma: true }), { foo: [['1', '2', '3'], ['4', '5', '6']] });
+        st.deepEqual(qs.parse('foo[]=1,2,3&foo[]=', { comma: true }), { foo: [['1', '2', '3'], ''] });
+        st.deepEqual(qs.parse('foo[]=1,2,3&foo[]=,', { comma: true }), { foo: [['1', '2', '3'], ['', '']] });
+        st.deepEqual(qs.parse('foo[]=1,2,3&foo[]=a', { comma: true }), { foo: [['1', '2', '3'], 'a'] });
+
+        st.end();
+    });
+
     t.test('parses an object in dot notation', function (st) {
         var input = {
             'user.name': { 'pop[bob]': 3 },